I found this is the
best method. The malware changes your proxy server settings which keeps redirecting web page requests, which many sites don't mention needs attention.
If the F8 method doesn't work on boot, try this way:
Switch on computer as normal, let it complete the boot to your desktop.
Log off as user (Do not reboot/turn off)
Log on again and immediately and repeatedly, start pressing the key sequence; Ctrl Alt Delete, until you get the Task manager or process manager dialogue box appear.
Stop pressing CAD, then:
In the process tab you will see random entries. The ones I saw were a sequence of
random numbers.exe, and there was about 4, maybe 5 entries.
Stop those processes. Highlight them and click on End Process. Once done, pick up at Step 2 in the link.
The software MalwareBytes Anti-malware is a genuine product and will clean your computer for you.
Let us know how you get on.